Manufacture of paper or pasteboard.



. facilitated if the tank be'provided with'a lTED STATES nuco Conn, or More, GERMANY. s

MANUFACTURE OF PAPER on PASTEBOARD. f

PATENT OFFICE.

slancrrrcarron forming part of Letters PatentNo. 655,850,. dated-August 14, 1 900..

5 many, have invented certain new and useful Improvements in the Manufacture of Paper 'or Pasteboard, of which the following is a specification.

This invention has for its object the manuio factureof paper or pasteboard capable of ref ceiving impressions and applicable for use'in metal-casting andin the production of stereotype-matrices, embossed wall-papers, and the ,like by so changing the structure of suitable; :5 f raw materials- .-such,' for instance, as cellulose, ..rags, residues. sit material, and paper scrans orresidues from-the, manufacture of paperbytreatment with caustic-soda lye that'the fibers are separated and curled up. By this curlingof the fibers hollow spaces are formed in the paper or pasteboard prepared therefrom, which make the product looser or more porous and capable of receiving impressionsq ,If the surface ot: the paper or pasteboard thus produced be given a suitable coata ing of china-clay, French chalk, talc, or the like, it is rendered non-susceptible to heat, whereby'the paperor pasteboard is adapted for use as a matrix in casting stereotypeplates. The makingof such paper and pasteboard is preferably carried out most cheaply -from paper scraps or residues free from wood.

In carrying the invention into effect such paperscraps or materials' are conveyed into a-tank provided with a kneading and mixing apparatus after the tank has been filled with a causticesoda solution of 9 Baum and it-is heated to about 100 centigrade. The raw material is disintegrated in about'two hours and the lye is pumped oif, which process is double bottom, the'upper one of which is perforatedin the form of a sieve. The pumpedofi lye can always be again utilized for disin tegrating fresh raw material. lhe half-stud thus obtainedjs washed with hot water and conveyed into-a rag-engine, which; grinds it into fully-prepared material, after which it is neutralized by theedditionof hydrochloric o acid, In order to make paperand pasteboard from the material thus treated, a Fourdrinier Application filed March 28, 1899 Serial No- 710,817. (No speoimena) machine with an rupperwire is employed which must have no press-roll and no suction device, in order that the fibers may remain in theirloose crinkled orcurled position. By this means the paper or pasteboard reaches the drying-cylinder with about ninety degrees oi water, and gauze must be used in stead of-"the usual drying-felt to allow this.

large amount of moisture to better escape from the paper and pasteboard. The result ing product is asoft open'porous paper or pasteboard according to whether it has been allowed to run onto the Fourdrinier machine in a thick or thin layer and which is adapted to receive an impression under the slightest pressure and which. does not allow the impressionto again disappear.- In otherwords, the impression is permanent.

If the paper or pasteboard is to be used as a "matrix and rendered resistant to molten metal, the upper surface is. coate'd,'while the paper or pasteboard is traveling over the dry;

ing-cylinder,by means of a rotary brush-roller,

with a finish or paste formed as follows: ten kilograms of china-clay and ten kilograms of talc are mixed in one hundred liters of water, and to this are added .one hundred liters of an emulsion produced by boiling three kilograms of quince-seeds (Semen cydomte) 1n two hundred liters of water. This White finish is conveyed into a vessel fitted with a stirring apparatus, from which it flows into a box 1n which a brush-roller revolves, over which the paper or pasteboard band is conveyed.

If the paper or pasteboard 1s to be em ployed for formingrelief or embossed wallpapers, it is passed between the rollers of a roller-press the upper cyllnder of which has a pattern deeply engraved. By this means "the pattern is embossed on the paper or pasteboard, while the flat spaces between the pattern are compressed, and thereby become thinner and harder. If the engraved roller be brought in contact with colored rollers, any desired color or bronzing or shade may 7 be imparted to it, and by means of a suitable Covering layer an imitation of leather wallhangi ng may be produced.-

Ifit be desired to render the walhhangings or wall-paper resistant to moist walls, the rear sideis allowed to travel over a rotating brushtion:

- If the paperor pasteboardi is to be made of cellulose, the process is precisely the same as the one already described in which waste pa-- per is used; but if"it is to be made from rags or fragments of fabrics they are first cut and the dust beaten out and then washed and ground in a rag-cylinder to half-stuff, which are then brought into the drip-box, the water pressed out and afterward conveyed into the lye-tank, and then further treated in t-hem anner hereinbefore described. y

Y Having thus described my invention, the following is what-I claim as new therein and desire to secure by Letters Patent:

1. The process for the manufacture of paper or pasteboar'd, which consists in treating vegetable fibers with Warm caustic lye of 9 26 Bau m at a temperature of about 100 centigrade, for about two hours in order to ruffie or curl the fibers, washing the fibrous'material in hotwater, subjecting the mass to the usual beating until it becomes an integral mixture, neutralizing the pulp with rhuriatic acid spreading it in a film withoutpresfsilreor suction for the purpose of laying the felted fiber without compressing it; substantially as described.

2. The process for the manufacture of paper or pasteboard, which consists in treating vegetable fibers with warm caustic lye of. 9 Baum at atemperature of about 100 centigrade, for about two hours in order to ruflie or curl the fibers, washing the fibrous mate-- rial in hot water, subjecting the mass to the usual beating until it becomes an integral mixture, neutralizing the pulp with muriatic acid spreading it in a film without pressure or suction, for the purpose of laying the felted fiber without compressing it, and covering the pulp with a layer or coating consisting of a mixture of about one hundred liters of water, ten kilograms of china-clay and ten kilogramsof talcu m, and about one hundred liters of water having one and one-half kilograms ofquince-seeds boiled therein substantially as described. K a

In witness whereof I have hereunto set my handin presence of two witnesses a 4 HUGO COHNZ; Witnesses:

j HENRY. HASPER,

WOLDEMAR HAUPr. 

